Process for the manufacture of artificial silk



Patented Dec. 19, e

IlltGCESS FUlt THE MANUFACTURE OF ARTIFICIAL SILK Adrianne Johannes Leonard Moritz, Erika, N. 0., L assignor to American Erika Corporation, New

York, N. Y a corporation of Delaware No Drawing. application October 3, 1932,

. Serial No. 836,095

Claims. (Cl. Ila-54) My invention relates to the manufacture of a The ripening and other steps, subsequent to new type of colored artificial filaments more the addition of the titanium oxideyresultin the closely resembling those of natural raw silk. inclusion of these particles about from 24 to '72 More especially my invention concerns. a hours prior to thetime the solution is to be spun.

method for giving a natural sill; like lustre and Instead of titanium dioxide, Imay use thorium improved dyeing qualities to filaments produced oxide, Wolfram oxide, zirconium oxide, or tin by the viscose process. oxide.

The object of the present invention is to pro- Just prior to the spinning of. the solution in vide a process whereby coloring chemicals may order to produce artificial yarn, a small quantity be incorporated into a-viscose solution prior to the of pine oil, usually less than 1.5% calculated on spinning thereof and whereby the resulting visthe total weightoi the viscose, is added; I may cose solution is subsequently treated with a dealso add a small amount of lanolin. lustering agent. The resulting filaments have dispersed there- 7 Former inventions concerned the production of through separately, the finely divided pigment a low lustre filament by the use of pigments exand oil. As a result, a filament which is colored,

clusively, but the use of pigments alone results in due to the presence ofthe particles of pigment, a thread which is physically weakened due to the and which has a silk-like lustre due to the necessity of employing a much larger percentage presence of the pine oil,is produced. of the pigments than is necessary in my process. I exp fl I v found that W The filaments obtained by using the prior titanium oxide is employed in amounts less than 7 processes does not resemble real silk since they 0.5%, it does not, of itself, produce a dull lustre are totally dull and lifeless in appearance. y The Dresfillce (0f the titanium O ide acts The procedure followed in my invention does only to make the filam n 6 parent. It. not result in a lowering of the physical properties has no efiect 0n the Surface appearance of the v and the filaments resulting from my process have fi s, and h surfafie lustre of d ry 3 a sub-surface lustre and covering power closely h us y remains- Y resembling those possessed by natural silkfila- When filaments which contain o y titanium. ments. oxide are dyed black, dark blue, etc., and are com- Other. objects will become apparent from a pared W Similarly y d O y s H study of the-following specifications and claims. fila the (i effect is not pp d It should be noted that while I am describing the resulting fi am t no way resemble a my invention with reference to the viscose 11ml S lk. process, I do not wish to be limited thereto, since My inv nt th i s in th mbine my process may be used in connection with any tion of the two chemicals in the resultant filaof the so-called wet-spinning processes. 7 ments, the subsequent action of the oil produc- -6 In the preparation of the viscose solution, for inc 8 fi a W th a ac lustre y spinning, cellulose is treated with an alkali soluresembling real natural Silk. tion to form alkali cellulose, which is allowed to AS eX p 0f the manner in Which y new ripen or age. The alkali cellulose is then subinvention may be Carried thefollOWing a 40 jected to the action of carbon bisulphide, to form given! a Xanthate. This treatment usually lasts from fl iv I Watery paste of um Oxide 2-3 hours. Too short a treatment results in an amount to 0.02% of the viscose solution is made unaltered alkali cellulose which will not dissolve. up, an incorporated, y miXing, i o the Solution In my new process I mix with the alkali celluwhen it is first formed. The particles are thorlose or xanthate solution a watery dispersion of oughly dispersed throughout the solution during m0 titanium oxide. Due to subsequent mixings and this mixing and the subsequent filtrations, etc. filtrations the fine particles of titanium oxide After a period of approximately hours the soare dispersed equally throughout the viscose solulution is in condition to be spun. Then about tion. 0.9% of pine oil is added, the solution thoroughly 59 It has proved absolutely unnecessary to use oils Bd, a d p into filaments, films, 5 or other agents to obtain a satisfactory disper- Example II .The process set forth in Example sion of the pigments throughout the viscose sclu- I is followed, but together with the pine oil, about tion. In the neighborhood of from 0.05 to 0.4% 0.1% of lanolin, calculated on the viscose soluof titanium dioxide (calculated on the cellulose tion, is added to the solution.

icontent of the solution) may be used. Having nowset forth my invention as required no by 'the'patent statute's, what I desire to claim is:

1. In the manufacture of colored filaments, films, yarns and the like possessing a silk like lustre from cellulosic solutions the combination of the steps of incorporatinginto the solution, at the time it is made, from 0.05 to 0.4% of a pigment, calculated on the cellulose content, and then prior to spinning, adding to and mixing with the solution, less than 1.5% of pine oil, calculated on the viscose solution.

2. In the manufacture of colored filaments, films, yarns and the like from viscose solutions. and possessing a silk like lustre, the combination of the steps of incorporating into the solution, at the time it is made from 0.05 to 0.4% of titanium oxide, calculated on the cellulose content, and then prior to spinning, adding to and mix ing with the solution, less than 1.5% of pine oil, calculated on'the viscose solution.

3. In the manufacture of colored filaments, films, yarns and the like possessing a silk like lustre from viscose solutions, the combination of the steps of incorporatingrinto the solution, at the time it is made, from 0.05% to 0.4% of tho- I rium oxide calculated on the cellulose content,

and then prior to spinning, adding to and mixing within the solution, less than 1.5% of pine oil, calculatedon the viscose solution.

4. In the manufacture of colored filaments, films, yarns and the like possessing a silk like lustre from viscose solutions, the combination of p the steps of incorporating into the solution, at the time it is made from 0.05% to 0.4% of wolfram oxide calculated on the cellulose content,

and then prior to spinning, adding to and mixing 

